Nizhniy Novgorod State Technical University named after R. E. Alekseev (Nizhniy Novgorod, Russia):

G. V. Pachurin, Dr. Eng., Prof., the Chair “Industrial safety, ecology and chemistry”, e-mail: pachuringv@mail.ru
D. A. Goncharova, Magister, the Chair “Industrial safety, ecology and chemistry”
A. A. Filippov, Cand. Eng., Associate Prof., the Chair “Industrial safety, ecology and chemistry”
T. V. Nuzhdina, Cand. Eng., Associate Prof., the Chair “Industrial safety, ecology and chemistry”

The analysis of methods for applying metallic coatings used in production conditions has been given. Their advantages and disadvantages have been shown given. Zinc and cadmium are used to protect steel structures from corrosion, and nickel, chromium, nickel-chromium are used for heat-resistant coatings. According to the effect on mechanical characteristics during static tests, the types of diffusion saturation can be divided into the following groups: a) reducing strength and ductility; b) increasing strength and reducing ductility; c) reducing strength and increasing ductility. At the same time, regardless of the group, the endurance limit of smooth samples is higher than that of samples with stress concentrators. Many diffusive saturations (chrome plating, galvanizing, etc.) increase the corrosion fatigue resistance of steels, but experimental data on optimal coating thicknesses are practically absent. Limited systematic literature data make it difficult to predict the behavior of steels with coatings during operation. However, it was found that the gas-phase nickel coating with a thickness of up to 30 μm has good adhesion with the substrate, has no pores and is resistant to the effects of corrosive environment. The change in the technological temperature of the substrate for the same coating thickness under static tension does not affect the mechanical characteristics of the material, and with increasing coating thickness, the strength and plastic properties also remain almost unchanged. At the same time, despite some reduction in fatigue characteristics, gas-phase coating of steel products with nickel up to 30 microns thick can be considered expedient due to its high chemical stability and simplicity of the process. Analysis of literature data revealed the absence of systematic information on the negative impact of metal plating methods on the environment.

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